An antigen is anything recognized by your immune system. Antigen tests diagnose viral infections, monitor certain illnesses or look for stem cell compatibility.

In immunology, an antigen (Ag) is a molecule, moiety, foreign particulate matter, or an allergen, such as pollen, that can bind to a specific antibody or T-cell receptor. [1]

Sep 26, 2025 · Antigen, substance that is capable of stimulating an immune response, specifically activating lymphocytes, which are the body’s infection-fighting white blood cells. In general, …

Sep 5, 2025 · An antigen is a molecule that may be recognized by the immune system and trigger an immune response by activating leukocytes (white blood cells) that fight disease.

Oct 25, 2023 · An antigen is a molecule or particle, often found on the surface of cells, viruses, or bacteria, that triggers an immune response because the body recognizes it as foreign or non-self.

Jul 8, 2023 · An antigen is any substance that causes your immune system to produce antibodies against it. This means your immune system does not recognize the substance, and is trying to …

Antigens are how the body identifies foreign substances. Antigens exist on viruses, bacteria, allergens, parasites, proteins, cancer cells, and normal cells in your own body. When the …

An antigen is a molecule - commonly a protein, polysaccharide, lipid, or nucleic acid - that the immune system recognizes as foreign, leading to initiation of a targeted immune response.

Antigens include toxins, chemicals, bacteria, viruses, or other substances that come from outside the body.

What is an Antigen? “An antigen is a molecule that initiates the production of an antibody and causes an immune response.” Antigens are large molecules of proteins, present on the …